Add Manager of that Team, which the player you want, plays for, and relegate him to the Reserves, Fining him for no Reason, and setting His stats to Not needed. Then go put an offer in and your have to pay half of his value price in, or else the Board will see it as unrealistic offer!
Then just give him what he wants!
(Some times you need to be nasty to them for up to a couple of weeks, then just Retire as there manager, You could also sack half their Management if you wanted!?)